Antifriction metal



Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

ROBERT JAY SHOEMAKER, OF CHICAGO, ILLINOIS, ASSIGNOR TO S. & 'I. METAL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ANTIFBICTIOK METAL.

1! Drawing.

-My invention relates to anti-friction metals composed principally of lead and the object of the invention is to provide a hardened, toughened and stable alloy of lead 5 suitable for bearings, bushings or other elements where anti-friction properties are required or where, for other reasons, a hardened and toughened lead is required.

A further object is to provide a lead alloy of this type which can be manufactured atlow cost.

A further object is to provide a lead alloy which will not corrode when subject to moist atmosphere.

This application is a continuation in part of my copending application filed April 29, 1927, Serial No. 178,702.

The following examples will serve to illustrate the principles governing the compounding of the alloy of the present invention. Modifications will be suggested and these modifications and allembodiments of the invention within the scope of the appended claims are intended to be covered by 5 the patent.

Example 1.-This alloy is compounded of the following substances in the proportions by weight substantially as follows:

Calcium 0.1% Magnesium 0.1% Tin 5.0% Aluminum 0.02% to 0.1%

Lead-to make up 100%.

The alloy will have a hardness of approximately 19 Brinell. The magnesium appears to act as a hardener of the lead provided that tin is present. It does not seem to act as a hardener, at least to the same degree, if tin is not present. If both substances are used, the magnesium lower limit may be 0.02%. The calcium may be' varied from 0.1% to 1.0%. The tin may be used in quantities from 1.0% to 5.0%, but when in small amounts the metal will lack hardness and when used in (fiuantities above the upper limit specified, t e alloy tends to become too brittle.

The aluminum plays no part as a harden- Appl ioation filed December 23, 1927. Serial 170. 242,290.

ing agent, but tends to keep the calcium and '60 magnesium from drossing out, when the alloy is melted and in compounding, and checks the tendency of the alloy to corrodewhen', exposed to'a moist atmosphere.

Ewample 2.The alloy consists of the 1501- lowing substances in the proportions by weight substantially as follows:

Calcium 0.4%

Magnesium 0.2% 00 Aluminum 0.02% to 0.1% Tin 1.0%

Lead to make up 100%.

Calcium 2' 0.1% to 1.0%

Magnesium 0.02% to 0.3% Aluminum as stated, and Tin 1.0% to 5.0%

Larger quantities oi aluminum can be used but theefl'ect is detrimental, not beneficial. If more than 0.1% is employed, the so excess will not go into solution and its pres ence tends to make the metal viscous when melted.

The alloy is compounded as follows:

The lead is first melted and heatedto red heat, approximately 1600 F. The melt is covered with a molten flux of calcium chloride. The tin and aluminum are introduced together as an aluminum tin alloy or con- 4 secutively as separate ingredients. The calno cium is then stirred in followed by the magnesium. The temperature during these operations is maintained at substantially 1600 F. The metal. is poured and the flux skimmed off. The calcium and magnesium are put in in the form of sticks, lumps or bricks. Powder and turnings oxidize too easily.

I claim: 2. Alloy consisting grin cipally of lead an l 1. Alloy consisting principall 0 f lead and cpntalnmg the follownig metals in qua ant 10 containing the following meta s in quant 1 ties by we ght substantially gs follows m3 ties by weight substantially as follows: tin 1.0% calcium 0.4%; magnesium Q.2%, an 5 1.0% to 5.0%; calcium 0.1%ito 1.0% gonggaluminum 0.02% to 0.1%.

iiii i f' to and a ummum BQBERT JAY SHUEMAKER.

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EKQEEER'E 3A)? Slim HE is hereby certilliml that warmzappears in the printed gmcififi calimi (Di this shave mumliemd pafieml rec aiming correcfiiozi as iollows: Page i Him R7, for "178,702" rieml "MZWZ"; and that the said Letters Patent should Rm mad with this wrrmcftim llmmim filial tlae'same may conform to the recmrcl @E the case in ills Ffimm iffiice Sigmd am mm iilmias 26th filmy 0E March, A. i). 'WZQ M. 36 mm, (Seall I Acting fioiwiomezrwl Patents.

CERTIFICATE OF CORRECTION,

Patent No. 1,703,212. Granted February 26, 1929, to

ROBERT JAY SHOEMAKER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 17, for "178,702" read "187,702"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 26th day of March, A. D. 1929.

M. J. Moore, (Seal) Aeting Commissioner of Patents. 

